waygate means the tailrace of a mill. Lexicurio rates it Sui generis — a strength score of 91 out of 100.
Etymology
From way + gate.
noun
- The tailrace of a mill.“1 and 2 are connected to one pipe, B, which leads to the pitshaft -- descends close to the side of the same — and then passes horizontally along the top of the waygate, whence branches lead off to the different workings where the men are employed”